The Recycler began stashing antiprotons around 4 PM and ended at 5:06 PM. Pbar resumed stacking.

At 5:07 PM, MIRF2 tripped off three times. Three minutes later it tripped off repeatedly. An operator called an expert.

MCenter resumed taking beam 5:18 PM.

At 9:07 PM, MIRF14 tripped off for the first of four times in an hour. It reset okay each time.

At 9:16 PM, MI experts tried to conduct a study, but problems with a module made them cancel the study.

Friday April 15
The midnight shift began with Operations monitoring store 4098 and the stash, with Pbar stacking and conducting studies, and with MiniBooNE and MCenter taking beam.

At 1:12 AM, Operations reported a beam alarm at the AP1 transfer line. Operators investigated and called in an expert to help. Beam seemed to be mistuned.

At 2 AM, Operations reported that neither operators nor the expert were able to solve the AP1 line beam problem. Investigations continued.

At 4:22 AM, MI experts reported that a quadrupole in the P2 transfer line might be causing the problem. Another expert was called in. Operators continued to investigate.

At 6:02 AM, a MI expert reported that there was a focusing problem in the P1/P2 line.

The Plan for Friday and the Weekend
The plan for today is to find the problem in the P1 or P2 transfer lines or to try and tune around the problem so stacking can resume. By 8 AM this morning, the investigation had centered on a possible bad quadrupole magnet. Investigations continue.